DYNAMIC PRESSURE BEARING DEVICE - NTN TOYO BEARING CO LTD

Title:

DYNAMIC PRESSURE BEARING DEVICE

Document Type and Number:

WIPO Patent Application WO/2005/068858

Kind Code:

A1

Abstract:

A dynamic pressure bearing device enabling the prevention of the deterioration of accuracy in its assembling and the lowering of strength and also enabling a reduction in cost. A guide face (2c) used as a guide when a disk hub (3) is press-fitted onto a shaft member (2) is formed on the shaft member. Then, the guide face (2c), the outer peripheral surface (2a3) of the shaft member (2) adjacent to the guide face (2c), and a boundary part between the guide face (2c) and the outer peripheral surface (2a3) are simultaneously ground to form an obtuse part (2d) with radius (r) at the boundary part. Since edges between the guide face (2c) and the outer peripheral surface (2a3) are eliminated, a press-fitting resistance produced when the disk hub is press-fitted onto the shaft end of the shaft member (2) can be reduced.

Inventors:

HAYAKAWA YUKITAKA (JP)
HIRADE JUN (JP)
KURIMURA TETSUYA (JP)

Application Number:

PCT/JP2005/000556

Publication Date:

July 28, 2005

Filing Date:

January 12, 2005

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD (JP)
HAYAKAWA YUKITAKA (JP)
HIRADE JUN (JP)
KURIMURA TETSUYA (JP)

International Classes:

F16C3/02; F16C33/10; F16C35/02; F16C17/10; G11B19/20; (IPC1-7): F16C17/10; F16C3/02; H02K7/08

Foreign References:

JP2000270530A	2000-09-29
JP2003322136A	2003-11-14
JPH0329723U	1991-03-25
JPH09105418A	1997-04-22
JPH08212687A	1996-08-20
JP2004282955A	2004-10-07